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That is why other security functions (such as intrusion detection and monitoring, and computer virus scanning) should be used together. However, it is observed that the boundary between firewall and other security measures is becoming blurred as firewall manufacturers continuously incorporate additional features, e.g. Virtual Private Network (VPN), encryption, etc. to firewall.
Two packet-filtering routers (one external and one internal) are used to filter and route the selected traffic to the firewall from either external side or internal network. In order to connect to the Internet, the external packet-filtering router should be set up. The internal packet-filtering router is used to separate the DMZ segment